If you notice the appearance of irregular transmissions (transmission stop, then after a few hours reboot of the device with transmission of the 0x10 and 0x20 configuration frames, then transmission stop again, then restart,...) whereas up to now your PULSE has been working regularly, this is certainly a sign of a "Low Bat". 

To check this, you need to look at the last regular frame transmitted before this irregular sequence. Low bat is indicated by the frame status bit. (see article how to detect a Low Bat). 

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